PHYSICS SENIOR TWO O'LEVEL - COLLEGE … · 2010-09-22 · PHYSICS SENIOR TWO O'LEVEL ... In...
Transcript of PHYSICS SENIOR TWO O'LEVEL - COLLEGE … · 2010-09-22 · PHYSICS SENIOR TWO O'LEVEL ... In...
COLLEGE DOCTRINA VITAE
PHYSICS SENIOR TWO O'LEVEL
PRESENTED BY JEAN BOSCO KUBWIMANAPHYSICS TEACHER,SCIENCES DptProduced by: JOHNNY
NDERA, 2010
COURSE CONTENT
TOPIC I:MECHANICS
CHAP I: Kinematics of rectilinear motionCHAPII: Dynamics of rectilinear motionCHAPIII:Work,Power and energy
TOPIC II: HEAT
CHAP IV: ThermometryCHAP V: Transmission of heatCHAP VI: Expansion of bodies
CHAP VII: Principles of heat exchange
CHAP VIII: Change of physical states
*Gazeous*Liquid
*Simple machines
TOPIC I:MECHANICSCHAP I: Kinematics of rectilinear
motion
INTRODUCTION AND DEFINITIONS
MEHANICS
Is a part of Physics which studies three main parts:KinematicsDynamicsStatics.
Kinematics studies motins without considering forces
In dynamics we study motions considering causes of motions:forces
In statics we also study motions of bodies at rest.
KEY WORDS
TrajectoryCoordinate system
Reference frameTraveled distance and displacement.
DIFFERENCE BTN DISTANCE AND DISPLACEMENT
The distance is the interval between two pts or lenght btn two points whereas displacement is the distance in a specified direction or the change in the position of the moving body. Both they share same unit (m).e.g The two moving car in opposite direction.
1. POSITION OF THE POINT IN THE CARTESIAN PLANE
The cartesian plane is asystem of two axes : vertical and horizontal axis. The coordinate
is a combination of two elements abscis and ordinate e.g:A(2,5),B(-3,8).
1.2 UNIFORM RECTILINEAR MOTION (URM)
A. Definition
URM is a motion on a straight line whose velocity is a constant.
e.g A car moving on a straight road.
A particle is an object which has mass but with negligeable size
DIFFERENCE BTN SCALAR AND VECTOR QUANTITIES
A scalar is any quantity described by only one thing:Magnitude A vector is a quantity described by only two things: Magnitude and direction.
The Position of a pt is therefore described by magnitude and direction.
e.g Distance is the scalar qtyDisplacement is the vector qty
C.AVERAGE SPEED AND VELOCITY
Av. Speed V=d/t[m/s],where d-distanceAv. Velocity V=displacement over
time.[m/s]
v
d
1.3.UNIFORMLY VARIED RECTILINEAR MOTION
ACCELERATION
Acceleration of the moving body is the change of its velocity per unit time denoted by 'a' and is expressed in m/s²
A body accelerates if its velocity increases and deccelerates if its velocity decreases.
UNIFORMLY VARIED RECTILINEAR MOTION
A motion is UVRM when its acceleration remains constant remains constant in time.
There two types :*Uniformly accelerated Rectilinear Motion
(UARM) whose acceleration is positive.*Uniformly decelerated Rectilinear Motion (UDRM),whose acceleration in negative.
CHAP 2:DYNAMICS OF RECTILINEAR
INTRODUCTION
Recall that dynamics is the part of physics which studies motions with their causes:forces.
KEY WORDS
*Inertia *Action*Reaction*momentum*Force
2.1 NEWTON'S LAWS OF MOTION
First law: PRINCIPLE OF INERTIA
Inertia is the reluctance( not willing to do something) of a body to start moving if
at rest or to stop moving if at rest.eg:Passengers in a moving vehicle
they can feel inertia.
STATEMENT OF THE LAW
CONT'D:FIRST LAW
“A body cn't change by itself its state of motion or rest if no force exerted on it”
SECOND LAW: FUNDAMENTAL RELATION OF DYNAMICS
If a force acts on a body whose mass m ,it communicate to the body an accelerationDenoted by “a ”
F=ma
Where F is the force applied to the body,m is the mass of the body and a is
the acceleration.
SPECIAL CASE
A body in free fall motion near the earth's surface under the force of gravity obeys
the Newton's 2nd law .
P=mg